Activating users/groups can be done in multiple ways:

• Using AllowUsers/AlowGroups directives globally - requires that user does have a Windows profile directory 

• Create a match block for a specific user/group (you can use directory isolation to specify a specific directory instead of user profile directory)

Copying public key can be done via Tools -> Copy public key. It uses the tool ssh-copy-id. You can use localhost to contact the copssh server.